Mathematics - 2017-11-09 (page 3 of 3)

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Balarka Sen

20:00

For all I know you might be

Semiclassical

It’s as good a theory as any

Ted Shifrin

waits for room to be banned

Balarka Sen

Tom Lehrer - The Masochism Tango

►

Eric Silva

@Semi it's ok no kink shaming here

Ted Shifrin

hides handcuffs

Balarka Sen

20:02

i have no problem with S&M at all

love that stuff

Ted Shifrin

I'm off to eat lunch. See y'all later.

Balarka Sen

Enjoy @Ted

Eric Silva

tchau

studrayght5

What happens if you tag someone not in chat?

Eric Silva

they die in real life

Daminark

20:12

Such a horrible fate

studrayght5

Lmao! I'm done.

Does anyone know a software that writes latex as animation in videos in the sense of showing letters being generated as if someone is writing them? Say for $\displaystyle \sum_{i =0}^{n}a_n$ you see the sigma drawing itself, then i, then the equality, the 0, the n, the a, and the n.

Well, I realise the sum doesn't make sense, but you get the idea!

Dragneel

20:35

I know of a popular Chrome extension here chrome.google.com/webstore/detail/daum-equation-editor/…

But I haven't found an easy-to-use software

Not sure if that's what you're looking for.

Manolis Lyviakis

21:07

they marked my question as duplicate

but i wanted a proof validation

the duplicate question did not have my proof

what to do

Kasmir Khaan

21:29

@MatheiBoulomenos Hello !

MatheiBoulomenos

Kasmir Khaan

How is going with your new subject?

and what are you studying? =p

MatheiBoulomenos

I'm studying elementary number theory, algebraic number theory, advanced complex analysis, group cohomology and étale cohomology. It's going okay, thanks

And for you? How's it going? Are you preparing for that representation theory course?

Kasmir Khaan

@MatheiBoulomenos wait whut, you do all that untill december?

Well still doing abstract algebra , I got an E on the exam, and asked my teacher to let me have the reexam, it is in 3 weeks =p

MatheiBoulomenos

These are the lectures I'm taking right now

Kasmir Khaan

21:34

But I feel like I get things alot better now

do you take them over the year?

like here in sweden

we do 2 months course than exam

sometimes 1.5 months than we take exam =p

MatheiBoulomenos

No, we have courses that go 4 months

Kasmir Khaan

oh nice =p

it is still alot of material for that period but good luck :D

I know you don't need it :D

MatheiBoulomenos

Thanks! Luck is always good to have

Kasmir Khaan

haha =p

anyways I wont bother ya no more :D did not knew you were this busy

and thanks for the help last 2 months :D

MatheiBoulomenos

No problem. I would like to help you, but I don't have much time

I mean, you can ask me, but I won't be here that regularly

Kasmir Khaan

21:39

I understand , and its fine :D

Ill do that when it is a very urgent thing ><

right now am just amazed how much we got from Group actions

like knowing that all p-Groups have no trivial center

I did not Think we can use them to prove such things, i mean they are very general

MatheiBoulomenos

yes, group actions are amazing

Kasmir Khaan

Well I should get back to work ! =p trying to be done with all Group theory part this weekend, then revisit ring theory =p

You should go back to work as well :D

MatheiBoulomenos

You're right! Good luck with your studies!

Kasmir Khaan

Thanks ! and good luck :)

Akiva Weinberger

21:57

Q: How did Dehn prove that the trefoil is chiral?

I understand that, in 1914, Dehn proved that the trefoil knot is chiral (it doesn't equal its mirror image). However, the paper in which he does so is in German, and I can't find a description of his proof anywhere else. The only proof I know of its chirality is through the Jones polynomial/Kauff...

So I got a good answer to a question I asked

asking how Dehn proved that the trefoil can't be deformed into its mirror image (so there are really two trefoils, called the right-handed one and the left-handed one)

so if anyone's curious you can look at that

Balarka Sen

I thought one way to do it is to look at the peripheral subgroup

Oh that answer does precisely that

It's a statement about a certain automorphism of $\pi_1(K)$ not existing

Mike Miller

22:17

I'm pretty sure I pinged something to that effect this morning.

Balarka Sen

I learnt that proof from you so very likely

Mike Miller

really? i don't remember that but i'll take it

Balarka Sen

yup

Gabriel Romon

@TedShifrin do you like probability (measure-theoretic) ?

Will Hunting

@GabrielRomon Why did you become White Square?

Akiva Weinberger

22:37

@MikeMiller I thought you did but I couldn't find it again so I wasn't sure

Oh I found it

Ted Shifrin

22:54

@Gabriel: I never studied it. I only taught a down-to-earth undergraduate course. It's my impression that "fancy" graduate probability is a whole bunch of measure theory real analysis ... convergence in measure, $L^1$, whatever ...

Dragneel

Isn't the Central Limit Theorem the same thing as Confidence Intervals? I'm reading my statistics book and they're similar

Gabriel Romon

23:19

@Dragneel they're not the same thing. It is true that one can use the CLT to derive asymptotic confidence intervals. The idea is that the mean of a sample is observable and ideally converges to the true parameter.

@Ted yeah, it's close to real analysis, which is one of the reason I like it

Balarka Sen

23:38

@Alessandro OH DAMN this is a good album

Eric Silva

@Ted sometimes there are rep theory probability things

p cool

Ted Shifrin

I can see that if we have things like integral geometry = geometric probability, full of group actions.

Alessandro Codenotti

@BalarkaSen which one?

Balarka Sen

@Alessandro The Paint the Sky Red album

I'm about halfway in

Ted Shifrin

we're back to full unsleeping mode

Balarka Sen

23:50

I shall fix it in the near future

Ted Shifrin

Come to think of it, Alessandro's up late, too.

Alessandro Codenotti

I was actually about to go to sleep but I saw Balarka's ping

Eric Silva

it's starting to get so dark so early

Balarka Sen

i like darkness

r/thisisverydeep

r/im14andthisisdeep

Alessandro Codenotti

The city where I study is at the bottom of a valley, the sun sets in the middle of the afternoon during winter

Adeek

23:54

hi @TedShifrin

Ted Shifrin

I think we should stay on "daylight saving" time year-round. Apparently I'm not the only one, @EricSilva.

hi Karim

Adeek

Today in class we showed that the every smooth algebraic variety is khaler.

the converse isn't true

So I was wondering let us say we weaken this little bit and we look at the fundmental group of complex algebraic variety can this be realized as the fundmental group of a particular khaler manifold ?

Ted Shifrin

Well, what you showed is easy. Algebraic varieties are projective by definition. So you get the induced Kähler structure. But, no, the converse is Hodge.

Adeek

yeah

Balarka Sen

Kahler groups are well-studied objects

Look at the paper by Mj-Biswas

Eric Silva

23:56

@Ted ya we need more of this daylight

Balarka Sen

They settle an open conjecture about classifying one-relator Kahler groups

Ted Shifrin

I know absolutely nothing about this stuff.